Leakproof bolt



V July` 28, 1936; l N.. GREENWELL LEAKPROOF BOLT Filed June 9, 1953 giel g4 s @j Patented July 28, 1936 ENT FFICE LEAKPROOF BOLT Nevil Greenwell, Bethlehem, Pa.,

assigner to Bethlehem Steel Company, a corporation of Pennsylvania Application June 9,` 1933, Serial No. 674,989

2 Claims.

My invention relates to improvements in bolts and more especially tobolts adapted for use in securing members of wood to other members of wood or of metal such for example as the nooring or sheathing of railway cars and for similar purposes.

It has been the usual practice in making bolts of this type to form the shank adjacent to the under side of the bolt head square in cross-section, or to provide the shank of the bolt with laterally extending iins to prevent rotation of the bolt when it is forced home in the Wooden member. It has been found however that bolts formed in this manner although adapted to effectively prevent rotation of the bolt, spread and disrupt the fiber of the wood in which they are installed and leave the wood surrounding the bolt accessible to water or moisture.

' One of the objects of my invention relates to means for securing a tight leak-proof joint between the timber and both the head and shank of the bolt to prevent Water or moisture from lodging beneath the head and around the shank of the bolt thereby causing rotting and deterioration of the wood. i

Another objectof my invention is to provide a boltv with a plain cylindrical shank and form the headof the bolt in such a manner as to prevent rotation and can be readily drawn into the timber to which it is applied so as to be flush with the face thereof.

Another object of my invention is to provide a bolt with the above mentioned advantages that can be economically manufactured, either 95 by hot or cold process, in the usual bolt-forming machine.

Referring now to the accompanying drawing in which like characters of reference indicate like parts;

Figure 1 is a View in section, with the bolt and nut in elevation, illustrating the application of my invention;

Fig. 2 is a transverse sectional view of the bolt taken on the line 2-2 of Fig. 3, showing a continuous rib wedge shaped in cross section extending from the underside of the head of the bolt, the plan being hexagonal.

Fig. 3 is a sectional View showing a fragment of Vthe Wooden member and the top portion of 50 the bolt taken on a vertical plane medially of the shank of the bolt showing the position the head of the bolt will assume just before the rib enters the wooden member.

Figs. Ll, 5 and 6 are transverse sectional views similar to Fig. 2, but showing alternative forms of bolt heads with the plan of the ribs on the under surface of the heads of the bolts as sinuous, square and oval respectively.

Fig. 7 is a sectional View similar to Fig. 3, but showing a chisel-shaped rib in cross-section on 5 the underside of the head of the bolt with the inclined portion of the rib on the outside thereof, and;

Fig. 8 is a vertical sectional View of the head portion of a bolt with a chisel-shaped rib with 10 the inclined portion on the inside of the rib.

Referring now to the numbers of reference on the drawings and rst to Figs. 1 to 3, the numeral I, indicates a fragment of a Wooden member which may be a portion of a car floor 15 or sheathing or the like which is secured to a metal framework, sill or brace 2 by means of bolts. The members I and 2 are perforated as at 3 and l respectively to receive the cylindrical shank 5 `of my improved bolt 6, which is screw- 20 threaded at one end as at 'I to receive a nut 8, lwhile the opposite end of the shank of the bolt 'is formed with an upset head 9 which is preferably made thin and disk shaped or annular but it may be formed square, oval, hexagonal or any 25 other shape Yif desired Without departing from the spirit of my invention.

The top surface of the head of the bolt is preferably made fiat while the under-side surface IU of the head is inclined slightly upwardly and outwardly from the shank 5 to the annular peripheral edge II of the bolt head. A continuous rib I2 wedge shaped in cross-section is formed integral with the head, extends downwardly at an intermediate point from the inclined underside surface I0. The plan of said rib being hexagonal having straight portions I3 parallel with each other with apices or corners I4.

In securing the members I and 2 together the shank 5 of the bolt 5 is inserted in the perfora- 40 tions 3 and li until the lower or penetrating edge of the rib engages the surface of the wooden member I as indicated in full lines in Fig. 3. The nut 8 is then screwed on the threaded end 'I of the bolt until it engages the face of the metal member 2, it is then screwed home until the lower surface of the head of the bolt is flush with the side of the wooden member as indicated in dotted lines in Fig. 3, or the nut can be tightened until the top surface of the head of the bolt is ush with the side of the wooden member as indicated in Fig. 1. In either case as shown in Figs. l and 3 just as soon as the cutting edge of the rib engages and enters the side face of the wooden member I, a seal is formed and owing to the shape of the rib the bolt is prevented from turning while the head of the bolt 'continues to be drawn into the wooden member, as Ythe nut is tightened.

In Figs. l to 8 I have shown alternative forms of continuously extending ribs, but otherwise the bolt is made similar to the bolt described in Figs. 1 to 3 and the same reference numerals will apply thereto. Y

' Fig.V 4 illustrates a. zig-zag rib having their apices I5 connected by portions I 6, these portions on one side of the shankV of the bolt being parallel to straight portions on the other side of said shank, or this rib may be formed crinkly or corrugated if desired.

It is manifest that other formsr of ribs can beV used Without departing from the spirit of my in-V vention. Thus a circular rib formed on the under sideof the bolt head and disposed eccentrically With respect to the shank performs the dual function of continuous sealingand of resisting the turning of the bolt, which function is one of the 'novel features Vof my invention. It is of course understood that the head `of the bolt may be pressed or hammered into its seat before the nut isV drawn up tightly in the bolt.v My sealing device is particularly useful inY connection with sheathing bolts, deck bolts andthe like. It may be used in conjunction with soft metals such as g lead or eopperand is also an effective gas seal in such a combination. An important feature of my invention is that even at the time of initial penetration of the tip of the rib into material Ato be fastened .it effectively functions as a sealing device and also Aas a device to resist rotation of the fastener member.

Y In Fig. 5 I have illustrated the continuous ribl Y tions I9.

InV Fig. '7 I have shown a chisel-shaped rib 20 in cross-section having the beveled portion 2| onY the outside of the rib and the straight portion 22 onthe inside of the rb'in parallel relation With the shank of the bolt, and in Figi 8,1 have shown a chisel-shaped rib 23 with a straight outside surface 24 and a beveled inside portion 25.

' in the claims.

Yin parallel alignment and in staggered relation 'Ihe plan of the ribs shown in Figs. and ma'y be in outline any one of the designs shown in'Figsi 1 to 6 inclusive if desired; f

Although I have shown and described my iniV vention in considerable detail, I do not Wish to beV limited to the exact and specic details shown and described, but mayuse such substitutionsfrnodiiications or equivalents thereof, as are embraced within'the scope of my invention, as pointed out Having thus described my invention what I y claim as new and desire to secure by Letters 'Patf l ent is: Y Y y 1. A fastener member comprising a shank cylindrical through its length, a head having an iii-V175 clined under-side surface, and a continuous pene,

trating rib extending from Vthe inclined under-v Y l'side surface of the head at a point intermediate the cylindrical shank and the periphery of 'thehj head adapted to be countersunk into the Irlerri-VZO;A ber 'through Which theishank of Vthe'V fasteningl.-

device extends toA hold it against rotation and'.l Y provide a sealing engagement with the said meine* ber and to prevent leakage beneaththe head and E; Y around the shank of the fastening device, saide25Y Y:

rib being in a plane Wholly above the shank an l havingv straight portionsk on one side of Vtheshank.

with the straight'portio'nson the opposite side of theshank adapted to'rprevent rotation'ofthe" fastener member asY it is drav/n into- V4thiervvooldY surface independent of any means on the shank.

2."A vwatertight-bolt for Wood, V comprising Va j. head and a 'cylindrical' shank having a threaded' w end,"a nut onthe threaded end of the shank,V said. i head Vhaving an inclinedV under-side face witha sinuous rib at'anintermedia point ,between the periphery of the head and the shank ofthe bolt,

' said sinuous rib being in a plane wholly above the Y shank and having straight portions on one sident@ of the shank in parallel alignment `and in stag-V Y gered relation With the straight portions ontheV y opposite side of the shank of the .bolt adapted Vto be drawn intothe Wood bysaidnut and preventv Y the bolt from turning independentof any means 4.5i on the shank Yand effect a sealing er1gagementYV 1 With the Wood under theV head vand around-the v shank When'the b oltis drawn up by the nut. Vj

NEvlL orR'EErIWEiJ;VV soif 

